Counties in Wisconsin by median age on 1 July (US county estimates)

Iron County had the highest median age on 1 July (US county estimates) of 72 counties in 2020, at 56.8 years. Menominee County had the lowest, at 34.1 years. The median was 43.8 years. Source: the U.S. Census Bureau.

Highest56.8Iron County

Lowest34.1Menominee County

Median43.872 counties

Map of counties, 2020

Under 39
39 to 42
42 to 44
44 to 46
46 to 50
50 and over

years, 2020. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2020 years	Change on 2019
1	Iron County	56.8	+0.2
1	Vilas County	56.8	+0.4
3	Florence County	56.2	+1
4	Burnett County	54.6	+0.7
4	Door County	54.6	+0.3
6	Bayfield County	54.3	+0.3
7	Adams County	54	+0.2
8	Oneida County	53	+0.5
8	Price County	53	+0.4
10	Sawyer County	52.9	+0.6
10	Washburn County	52.9	+0.4
12	Marquette County	50.4	+0.6
13	Waushara County	50	+0.6
14	Rusk County	49.7	+0.3
15	Forest County	49.6	+0.5
15	Langlade County	49.6	+0.3
17	Marinette County	49.3	+0.1
18	Lincoln County	49	+0.4
19	Oconto County	47.2	0
20	Crawford County	46.8	+0.1
21	Polk County	46.7	+0.5
22	Green Lake County	46.4	-0.3
23	Buffalo County	46.2	-0.1
24	Waupaca County	46	-0.2
25	Juneau County	45.9	-0.1
26	Pepin County	45.8	-0.8
27	Richland County	45.6	+0.3
27	Shawano County	45.6	-0.1
29	Barron County	45.2	+0.2
30	Manitowoc County	45.1	+0.1
31	Iowa County	44.5	+0.3
31	Ozaukee County	44.5	+0.1
33	Wood County	44.2	-0.2
34	Kewaunee County	44	+0.1
35	Green County	43.9	+0.4
35	Washington County	43.9	+0.2
37	Waukesha County	43.7	+0.2
38	Dodge County	43.5	+0.3
39	Taylor County	43.3	+0.4
40	Columbia County	43.2	+0.1
41	Ashland County	42.9	+0.2
42	Jackson County	42.8	+0.5
43	Douglas County	42.2	+0.1
44	Sheboygan County	41.9	+0.1
44	Vernon County	41.9	+0.2
46	Chippewa County	41.8	+0.2
47	Sauk County	41.7	+0.1
48	Walworth County	41.6	+0.9
49	Fond du Lac County	41.4	+0.1
50	Marathon County	41.2	+0.2
51	Calumet County	41	+0.5
51	Racine County	41	+0.1
53	Lafayette County	40.7	0
54	Jefferson County	40.6	-0.3
55	Rock County	40.3	+0.4
56	St. Croix County	40	+0.3
57	Trempealeau County	39.9	-0.2
58	Monroe County	39.6	+0.1
59	Winnebago County	39.1	+0.2
60	Kenosha County	39	+0.2
61	Portage County	38.9	+0.4
62	Outagamie County	38.8	+0.1
63	Pierce County	38.1	+0.4
64	Brown County	38	+0.3
65	Clark County	37.3	-0.3
66	Grant County	37.1	+0.2
66	La Crosse County	37.1	+0.3
68	Dunn County	36	+0.3
69	Dane County	35.8	+0.3
70	Eau Claire County	35.7	+0.2
71	Milwaukee County	35.1	0
72	Menominee County	34.1	+0.4

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Wisconsin by median age on 1 July (US county estimates), 2020) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Wisconsin by median age on 1 July (US county estimates), 2020. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Wisconsin by median age on 1 July (US county estimates), 2020. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Wisconsin by median age on 1 July (US county estimates), 2020 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_wisconsin_by_2020,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Wisconsin by median age on 1 July (US county estimates), 2020}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Wisconsin by median age on 1 July (US county estimates), 2020
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/wisconsin-counties?period=2020.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -

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Questions

Which county has the highest median age on 1 July (US county estimates)?

Iron County, with 56.8 years in 2020, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Menominee County, with 34.1 years in 2020.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.